/*
 * Copyright 2012 - 2014 Benjamin Weiss
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.keyboardsurfer.android.widget.crouton;

import android.view.View;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;

/**
 * Builds the default animations for showing and hiding a {@link Crouton}.
 */
final class DefaultAnimationsBuilder {
    private static final long DURATION = 400;
    private static Animation slideInDownAnimation, slideOutUpAnimation;
    private static int lastInAnimationHeight, lastOutAnimationHeight;

    private DefaultAnimationsBuilder() {
    /* no-op */
    }

    /**
     * @param croutonView The croutonView which gets animated.
     * @return The default Animation for a showing {@link Crouton}.
     */
    static Animation buildDefaultSlideInDownAnimation(View croutonView) {
        if (!areLastMeasuredInAnimationHeightAndCurrentEqual(croutonView) || (null == slideInDownAnimation)) {
            slideInDownAnimation = new TranslateAnimation(
                    0, 0,                               // X: from, to
                    -croutonView.getMeasuredHeight(), 0 // Y: from, to
            );
            slideInDownAnimation.setDuration(DURATION);
            setLastInAnimationHeight(croutonView.getMeasuredHeight());
        }
        return slideInDownAnimation;
    }

    /**
     * @param croutonView The croutonView which gets animated.
     * @return The default Animation for a hiding {@link Crouton}.
     */
    static Animation buildDefaultSlideOutUpAnimation(View croutonView) {
        if (!areLastMeasuredOutAnimationHeightAndCurrentEqual(croutonView) || (null == slideOutUpAnimation)) {
            slideOutUpAnimation = new TranslateAnimation(
                    0, 0,                               // X: from, to
                    0, -croutonView.getMeasuredHeight() // Y: from, to
            );
            slideOutUpAnimation.setDuration(DURATION);
            setLastOutAnimationHeight(croutonView.getMeasuredHeight());
        }
        return slideOutUpAnimation;
    }

    private static boolean areLastMeasuredInAnimationHeightAndCurrentEqual(View croutonView) {
        return areLastMeasuredAnimationHeightAndCurrentEqual(lastInAnimationHeight, croutonView);
    }

    private static boolean areLastMeasuredOutAnimationHeightAndCurrentEqual(View croutonView) {
        return areLastMeasuredAnimationHeightAndCurrentEqual(lastOutAnimationHeight, croutonView);
    }

    private static boolean areLastMeasuredAnimationHeightAndCurrentEqual(int lastHeight, View croutonView) {
        return lastHeight == croutonView.getMeasuredHeight();
    }

    private static void setLastInAnimationHeight(int lastInAnimationHeight) {
        DefaultAnimationsBuilder.lastInAnimationHeight = lastInAnimationHeight;
    }

    private static void setLastOutAnimationHeight(int lastOutAnimationHeight) {
        DefaultAnimationsBuilder.lastOutAnimationHeight = lastOutAnimationHeight;
    }
}
